CN110868738B

CN110868738B - Cell switching method, base station, eMTC terminal, and storage medium

Info

Publication number: CN110868738B
Application number: CN201810979040.3A
Authority: CN
Inventors: 郭峰
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2018-08-27
Filing date: 2018-08-27
Publication date: 2022-07-12
Anticipated expiration: 2038-08-27
Also published as: WO2020043034A1; CN110868738A; EP3833102A4; EP3833102A1

Abstract

The embodiment of the invention discloses a cell switching method, a base station, an eMTC terminal and a storage medium, and belongs to the technical field of wireless communication. The method comprises the following steps: the method comprises the steps that a source base station obtains RSRP threshold list configuration of adjacent cells, sends a measurement control message to an eMTC terminal, and receives a measurement report of the eMTC terminal, wherein the measurement report carries RSRP information of the adjacent cells; and selecting a target cell according to the RSRP information of the adjacent cell, the RSRP threshold list configuration and the enhanced coverage grade supported by the eMTC terminal, sending a switching request message to a target base station where the target cell is located, and sending an RRC connection reconfiguration message to the eMTC terminal after receiving a switching request confirmation message of the target base station. According to the embodiment of the invention, the coverage enhancement grade of the eMTC terminal possibly in the cell is evaluated before switching, and the appropriate target cell is selected to execute switching by combining the capability condition of the eMTC terminal, so that the risk of switching failure is reduced.

Description

Cell switching method, base station, eMTC terminal, and storage medium

Technical Field

The embodiment of the invention relates to the field of wireless communication, in particular to a cell switching method, a base station, an eMTC terminal and a storage medium.

Background

Low-cost MTC (Machine-Type Communication) terminals are increasingly becoming an important part of operators' increased revenue through mobile cellular network Communication. Considering the low delay and throughput requirements of such MTC terminals, and the fact that most MTC is only operated under GSM/GPRS, such eMTC terminals have low requirements. As LTE network technology matures, operators desire to migrate MTC terminal traffic from 2G to LTE networks. In the current application scenario, most MTC terminals are located inside a building or in a deep network Coverage, in order to solve the communication problem under deep Coverage, 3GPP R12 proposes a research topic of "Low-cost MTC terminal and enhanced Coverage", that is, the communication problem of BL (narrow-Bandwidth-reduced Low-complexity) terminal and CE (network enhanced Coverage) terminal, and writes the subject content into the 3GPP R13 standard through discussion. For convenience of description, the BL terminal and the CE terminal are hereinafter collectively referred to as eMTC (enhanced Machine-Type Communication) terminals.

According to the 3GPP R13 standard, when accessing a cell, an eMTC terminal performs PRACH (Physical Random Access Channel) resource selection according to a cell initial coverage enhancement level or RSRP (Reference Signal Receiving Power) threshold list configured by a base station. If the base station configures the initial coverage enhancement level and the corresponding PRACH configuration, the eMTC terminal initiates access according to the PRACH resource; otherwise, if the base station does not configure the initial coverage enhancement level, an RSRP threshold list for selecting the PRACH resource of the eMTC terminal must be configured, and the eMTC terminal determines the RSRP interval of which coverage enhancement level is located according to the measured RSRP of the cell, so as to select the PRACH resource configuration corresponding to the coverage enhancement level and initiate access.

When the cross-base station mobile switching is carried out, after an eMTC terminal reports a measurement report, a source base station sends a switching request to a target base station corresponding to a cell reported by the measurement, the target base station sends a switching command containing special physical resource configuration such as an initial coverage enhancement grade or an RSRP threshold list to the eMTC terminal through the source base station, the eMTC terminal judges and determines an enhancement coverage grade of the target cell according to the switching command, and selects a PRACH resource corresponding to the enhancement coverage grade to initiate access.

However, since the source base station cannot know the initial coverage enhancement level or RSRP threshold list configuration of the target base station, the enhancement coverage level of the eMTC terminal in the target cell cannot be evaluated. If the eMTC terminal does not support the enhanced coverage level in the target cell, and the source base station switches the eMTC terminal to the target cell, it may cause the failure of switching the eMTC terminal to access the target cell.

Disclosure of Invention

In view of this, embodiments of the present invention provide a cell switching method, a base station, an eMTC terminal, and a storage medium, so as to solve a technical problem that an eMTC terminal fails to switch to a target cell due to a source base station switching the eMTC terminal to the target cell without supporting an enhanced coverage level in the target cell.

The technical scheme adopted by the embodiment of the invention for solving the technical problems is as follows:

according to an aspect of the embodiments of the present invention, there is provided a cell handover method applied to a source base station, the method including:

acquiring Reference Signal Received Power (RSRP) threshold list configuration of an adjacent cell;

issuing a measurement control message to an enhanced machine type communication (eMTC) terminal, wherein the measurement control message carries frequency points of adjacent cells supporting the eMTC terminal and corresponding measurement configuration;

receiving a measurement report fed back by the eMTC terminal, wherein the measurement report carries RSRP information of an adjacent cell;

selecting a target cell from the adjacent cells according to the RSRP information of the adjacent cells, the RSRP threshold list configuration of the adjacent cells and the enhanced coverage grade supported by the eMTC terminal;

sending a switching request message to a target base station where a target cell is located;

receiving a handover request acknowledgement message of a target base station, the eMTC terminal sends an RRC (Radio Resource Control) connection reconfiguration message.

According to another aspect of the embodiments of the present invention, there is provided a cell handover method applied to an eMTC terminal, the method including:

measuring a measurement frequency point according to measurement configuration carried by a source base station after receiving a measurement control message sent by the source base station, and feeding back a measurement report to the source base station, wherein the measurement report carries RSRP information of an adjacent cell;

receiving an RRC connection reconfiguration message sent by a source base station, desynchronizing the source base station, and initiating access according to the PRACH resource corresponding to the enhanced coverage level of the target cell;

and after the access is successful, sending an RRC reconfiguration completion message to the target base station.

According to another aspect of the embodiments of the present invention, there is provided a cell handover method applied to a target base station, the method including:

receiving a switching request message sent by a source base station, and acquiring an enhanced coverage grade carried by the switching request message for admission control;

and if the admission is successful, configuring corresponding PRACH resources of the enhanced coverage level, and sending a switching request confirmation message to the source base station.

According to yet another aspect of the embodiments of the present invention, there is provided a base station, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the computer program is executed by the processor, the method for performing cell handover is applied to a source base station or the method for performing cell handover is applied to a target base station.

According to yet another aspect of embodiments of the present invention, there is provided an eMTC terminal including a memory, a processor, and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of the cell handover method applied to the eMTC terminal.

In addition, an embodiment of the present invention further provides a storage medium, where a computer program is stored, and when the computer program is executed by a processor, the steps of any one of the cell handover methods described above are implemented.

According to the cell switching method, the base station, the eMTC terminal and the storage medium provided by the embodiment of the invention, the enhanced coverage grade of the eMTC terminal in a reported cell is evaluated according to the acquired PRACH configuration of the cell and the RSRP information of the cell reported by the eMTC terminal before switching by the source base station, and a proper target cell is selected for the eMTC terminal by combining the enhanced coverage grade supported by the eMTC terminal, so that the situation that the eMTC terminal does not support the enhanced coverage grade of the target cell is avoided, the eMTC terminal is switched to the target cell by the source base station to cause the failure of switching the eMTC terminal to access the target cell, and the failure rate of switching the eMTC terminal is reduced.

Drawings

Fig. 1 is a schematic structural diagram of an eMTC terminal according to an embodiment of the present invention;

fig. 2 is a system diagram of a wireless communication system according to an embodiment of the present invention;

fig. 3 is a flowchart of a cell handover method applied to a source base station according to an embodiment of the present invention;

fig. 4 is an interaction flowchart of an obtaining method for neighboring cell RSRP threshold list configuration according to an embodiment of the present invention;

fig. 5 is an interaction flowchart of an obtaining method for neighboring cell RSRP threshold list configuration according to an embodiment of the present invention;

fig. 6 is a flowchart of a target cell selection method according to an embodiment of the present invention;

fig. 7 is a flowchart of a cell handover method applied to an eMTC terminal according to a second embodiment of the present invention;

fig. 8 is a flowchart of a cell handover method applied to a target base station according to a third embodiment of the present invention;

fig. 9 is an interaction flowchart of a cell switching method according to a fourth embodiment of the present invention.

The implementation, functional features and advantages of the objects of the embodiments of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

In order to make the technical problems, technical solutions and beneficial effects to be solved by the embodiments of the present invention clearer and clearer, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings and the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the embodiments of the invention and are not intended to limit the embodiments of the invention.

In the following description, suffixes such as "module", "component", or "unit" used to denote elements are used only for facilitating the description of the embodiments of the present invention, and have no specific meaning in themselves. Thus, "module", "component" or "unit" may be used mixedly.

The eMTC terminal may be implemented in various forms, such as a BLeMTC terminal and a CEeMTC terminal.

Referring to fig. 1, which is a schematic diagram of a hardware structure of an eMTC terminal for implementing various embodiments of the present invention, the eMTC terminal 100 may include: RF (radio frequency) unit 101, WiFi module 102, audio output unit 103, a/V (audio/video) input unit 104, sensor 105, display unit 106, user input unit 107, interface unit 108, memory 109, processor 110, and power supply 111. Those skilled in the art will appreciate that the eMTC terminal structure shown in fig. 1 does not constitute a limitation of the eMTC terminal, which may include more or fewer components than shown, or some components in combination, or a different arrangement of components.

The following describes the components of the eMTC terminal in detail with reference to fig. 1:

the radio frequency unit 101 may be configured to receive and transmit signals during information transmission and reception or during a call, and specifically, receive downlink information of a base station and then process the downlink information to the processor 110; in addition, the uplink data is transmitted to the base station. Typically, radio frequency unit 101 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like. In addition, the radio frequency unit 101 can also communicate with a network and other devices through wireless communication. The wireless communication described above may use any communication standard or protocol.

WiFi belongs to a short-distance wireless transmission technology, and the eMTC terminal can help a user to send and receive e-mails, browse webpages, access streaming media, and the like through the WiFi module 102, and provides wireless broadband internet access for the user. Although fig. 1 illustrates the WiFi module 102, it is understood that it does not belong to the essential constituent of the eMTC terminal, and may be omitted entirely as needed within a scope not changing the essence of the invention.

The audio output unit 103 may convert audio data received by the radio frequency unit 101 or the WiFi module 102 or stored in the memory 109 into an audio signal and output as sound when the eMTC terminal 100 is in a call signal reception mode, a talk mode, a recording mode, a voice recognition mode, a broadcast reception mode, or the like. Also, the audio output unit 103 may also provide audio output related to a particular function performed by the eMTC terminal 100 (e.g., a call signal reception sound, a message reception sound, etc.). The audio output unit 103 may include a speaker, a buzzer, and the like.

The a/V input unit 104 is for receiving an audio or video signal. The a/V input Unit 104 may include a Graphics Processing Unit (GPU) 1041 and a microphone 1042, the Graphics processor 1041 Processing image data of still pictures or video obtained by an image capturing device (e.g., a camera) in a video capturing mode or an image capturing mode. The processed image frames may be displayed on the display unit 106. The image frames processed by the graphic processor 1041 may be stored in the memory 109 (or other storage medium) or transmitted via the radio frequency unit 101 or the WiFi module 102. The microphone 1042 can receive sounds (audio data) via the microphone 1042 in a phone call mode, a recording mode, a voice recognition mode, or the like, and can process such sounds into audio data. The processed audio (voice) data may be converted into a format output transmittable to a mobile communication base station via the radio frequency unit 101 in case of the phone call mode. The microphone 1042 may implement various types of noise cancellation (or suppression) algorithms to cancel (or suppress) noise or interference generated in the course of receiving and transmitting audio signals.

The eMTC terminal 100 also includes at least one sensor 105, such as a light sensor, a motion sensor, and other sensors.

The display unit 106 is used to display information input by a user or information provided to the user. The Display unit 106 may include a Display panel 1061, and the Display panel 1061 may be configured in the form of an LCD (Liquid Crystal Display), an Organic Light-Emitting Diode (OLED), or the like.

The user input unit 107 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the eMTC terminal. Specifically, the user input unit 107 may include a touch panel 1071 and other input devices 1072. The touch panel 1071, also referred to as a touch screen, may collect a touch operation performed by a user on or near the touch panel 1071 (e.g., an operation performed by the user on or near the touch panel 1071 using a finger, a stylus, or any other suitable object or accessory), and drive a corresponding connection device according to a predetermined program. The touch panel 1071 may include two parts of a touch detection device and a touch controller. The touch detection device detects the touch direction of a user, detects a signal brought by touch operation and transmits the signal to the touch controller; the touch controller receives touch information from the touch sensing device, converts the touch information into touch point coordinates, sends the touch point coordinates to the processor 110, and can receive and execute commands sent by the processor 110. In addition to the touch panel 1071, the user input unit 107 may include other input devices 1072.

Further, the touch panel 1071 may cover the display panel 1061, and when the touch panel 1071 detects a touch operation thereon or nearby, the touch panel 1071 transmits the touch operation to the processor 110 to determine the type of the touch event, and then the processor 110 provides a corresponding visual output on the display panel 1061 according to the type of the touch event. Although the touch panel 1071 and the display panel 1061 are shown in fig. 1 as two separate components to implement the input and output functions of the eMTC terminal, in some embodiments, the touch panel 1071 and the display panel 1061 may be integrated to implement the input and output functions of the eMTC terminal, which is not limited herein.

The interface unit 108 serves as an interface through which at least one external device is connected to the eMTC terminal 100. The memory 109 may be used to store software programs as well as various data.

The memory 109 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. Further, the memory 109 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.

The processor 110 is a control center of the eMTC terminal, connects various parts of the entire eMTC terminal using various interfaces and lines, and performs various functions and processing data of the eMTC terminal by running or executing software programs and/or modules stored in the memory 109 and calling data stored in the memory 109, thereby integrally monitoring the eMTC terminal. Processor 110 may include one or more processing units; preferably, the processor 110 may integrate an application processor, which mainly handles operating systems, user interfaces, application programs, etc., and a modem processor, which mainly handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 110.

The eMTC terminal 100 may further include a power supply 111 (e.g., a battery) for supplying power to various components, and preferably, the power supply 111 may be logically connected to the processor 110 via a power management system, so as to implement functions of managing charging, discharging, and power consumption via the power management system.

In order to facilitate understanding of the embodiment of the present invention, a communication network system on which the eMTC terminal according to the embodiment of the present invention is based is described below.

Referring to fig. 2, fig. 2 is an architecture diagram of a communication Network system according to an embodiment of the present invention, where the communication Network system is an LTE system of a universal mobile telecommunications technology, and the LTE system includes a UE (User Equipment) 201, an E-UTRAN (Evolved UMTS Terrestrial Radio Access Network) 202, an EPC (Evolved Packet Core) 203, and an IP service 204 of an operator, which are in communication connection in sequence.

Specifically, the UE201 may be the eMTC terminal 100, which is not described herein again.

The E-UTRAN202 includes eNodeB2021 and other eNodeBs 2022, among others. Among them, the eNodeB2021 may be connected with other eNodeB2022 through backhaul (e.g., X2 interface), the eNodeB2021 is connected to the EPC203, and the eNodeB2021 may provide the UE201 access to the EPC 203.

The EPC203 may include an MME (Mobility Management Entity) 2031, an HSS (Home Subscriber Server) 2032, other MMEs 2033, an SGW (Serving gateway) 2034, a PGW (PDN gateway) 2035, and a PCRF (Policy and Charging Rules Function) 2036, and the like. The MME2031 is a control node for processing signaling between the UE201 and the EPC203, and provides bearer and connection management. HSS2032 is used to provide registers to manage functions such as home location register (not shown) and holds subscriber specific information about service characteristics, data rates, etc. All user data may be sent through SGW2034, PGW2035 may provide IP address assignment for UE201 and other functions, and PCRF2036 is a policy and charging control policy decision point for traffic data flow and IP bearer resources, which selects and provides available policy and charging control decisions for a policy and charging enforcement function (not shown).

The IP services 204 may include the internet, intranets, IMS (IP Multimedia Subsystem), or other IP services, among others.

Although the LTE system is described as an example, it should be understood by those skilled in the art that the embodiments of the present invention are not limited to the LTE system, but may also be applied to other wireless communication systems, such as GSM, CDMA2000, WCDMA, TD-SCDMA, and future new network systems.

Based on the eMTC terminal hardware structure and the communication network system, embodiments of the method according to the embodiments of the present invention are provided.

Example one

As shown in fig. 3, a method for cell handover provided in an embodiment of the present invention is applied to a source base station, and the method includes:

and S31, obtaining the Reference Signal Received Power (RSRP) threshold list configuration of the adjacent cells.

Specifically, after the eMTC terminal selects a suitable PRACH resource to access the source base station, the source base station obtains RSRP threshold list configuration of the neighboring cell to determine whether the neighboring cell supports the eMTC terminal. The obtaining method includes, but is not limited to, obtaining RSRP threshold list configuration of the neighboring cell through an X2 interface, a base station configuration update message, or through a network management platform.

As shown in fig. 4, the method for obtaining RSRP threshold list configuration through an X2 interface is applied in the process of establishing X2, and the method includes:

and S41, the source base station newly adds the RSRP threshold list configuration of each cell in the PRACH configuration, and establishes a request message through X2 and sends the request message to the adjacent base station.

And S42, after receiving the X2 establishment response message fed back by the adjacent base station, acquiring RSRP threshold list configuration of each cell of the adjacent base station from PRACH configuration of the X2 establishment response message.

Specifically, in the process of establishing X2, the source base station adds the RSRP threshold list of each Cell (e.g., source Cell1) to the PRACH Configuration Cell, sends a REQUEST message (X2SETUP REQUEST- > Served Cell Information- > PRACH Configuration- > RSRP threshold list) established by X2 to the neighboring base station, configures the RSRP threshold list of each Cell (e.g., neighboring Cell 2 and neighboring Cell 3) below the neighboring base station to the PRACH Configuration Cell, and sends a RESPONSE message (X2SETUP RESPONSE- > Served Cell Information- > PRACH Configuration- > RSRP threshold list) established by X2 to the source base station. Therefore, the source base station sends the RSRP threshold list configuration of the cell under its own site to the neighboring base station through the X2 establishment request, the neighboring base station sends the RSRP threshold list configuration of the cell under its own site to the source base station through the X2 establishment response, and both the source base station and the neighboring base station can obtain the RSRP threshold list configuration of each cell.

As shown in fig. 5, the method for acquiring RSRP threshold list configuration of each cell of the neighboring base station in the base station configuration updating process includes:

and S51, the source base station newly adds the RSRP threshold list configuration of each cell in the PRACH configuration, and sends the configuration update message to the adjacent base station.

And S52, after receiving the configuration updating confirmation message of the adjacent base station, acquiring RSRP threshold list configuration of each cell of the adjacent base station from PRACH configuration of the configuration updating confirmation message.

Specifically, when the cell information is changed, the change of the information is notified by the base station configuration update message and the base station connected to the other X2 interactively. If the RSRP threshold list CONFIGURATION of the source base station is changed, in the base station CONFIGURATION updating process, the source base station (for example, source Cell1) adds the RSRP threshold list in the PRACH CONFIGURATION Cell, sends an UPDATE message (ENB CONFIGURATION UPDATE- > Served Cell Information- > PRACH CONFIGURATION- > RSRP threshold list) to the neighboring base station, after receiving the UPDATE message, the neighboring base station feeds back a CONFIGURATION UPDATE confirmation message to the source base station for confirmation, adds the RSRP threshold list CONFIGURATION of each Cell (for example, neighboring Cell 2 and neighboring Cell 3) below the neighboring base station in the PRACH CONFIGURATION Cell, and sends the UPDATE confirmation message to the source base station. Therefore, after the configuration of the RSRP threshold list of the cell is changed, the base station notifies other base stations established with x2 in the update message, and the other base stations feed back the configuration update confirmation message to the source base station for confirmation, and newly adds the RSRP threshold list configuration of each cell (such as the adjacent cell 2 and the adjacent cell 3) below the base station in the PRACH configuration cell and sends the PRACH configuration cell to the source base station. The source base station and the adjacent base station can obtain the RSRP threshold list configuration of each cell of each other.

Similarly, if the configuration of the neighboring base station is changed, a configuration update message can be sent to the source base station through the configuration update process, and the source base station feeds back the configuration update confirmation message to the neighboring base station, wherein the configuration update confirmation message carries the RSRP threshold list configuration of each cell below the neighboring base station.

In addition, in the mode of acquiring the configuration of the RSRP threshold list of the neighboring cell through the network management platform, the network management platform adds the RSRP threshold list configuration attribute of the neighboring base station cell having a neighboring cell relationship with the serving cell of the source base station to the neighboring cell list of the source base station. The source base station acquires the list of the adjacent cells from the network management platform, and simultaneously acquires the RSRP threshold list configuration attribute of each adjacent cell under the adjacent base station.

And S32, issuing a measurement control message to the eMTC terminal, wherein the measurement control message carries the frequency points of the adjacent cells supporting the eMTC terminal and the corresponding measurement configuration.

Specifically, after acquiring the RSRP threshold list configuration of the adjacent cell, the source base station determines whether the adjacent cell supports the eMTC terminal according to the support capability of the eMTC terminal, and if the adjacent cell supporting the eMTC terminal exists, sends a measurement control message carrying the frequency point of the adjacent cell and the corresponding measurement configuration to the eMTC terminal.

And S33, receiving a measurement report of the eMTC terminal, wherein the measurement report carries RSRP information of the adjacent cell.

S34, selecting a target cell according to the RSRP information of the adjacent cell, the RSRP threshold list configuration of the adjacent cell and the enhanced coverage grade supported by the eMTC terminal.

Referring to fig. 6, the target cell selection method in this step includes:

s61, acquiring RSRP information of the eMTC terminal in each adjacent cell from the measurement report;

s62, determining an RSRP interval of the eMTC terminal in the RSRP of each adjacent cell according to the RSRP threshold list configuration of each adjacent cell;

s63, determining a corresponding enhanced coverage grade according to the RSRP interval of the eMTC terminal in each adjacent cell;

s64, if the eMTC terminal supports the enhanced coverage level of a certain neighboring cell, selecting the neighboring cell as the target cell.

Specifically, the source base station acquires RSRP information of each neighboring cell from a measurement report reported by the eMTC terminal, and determines, in combination with RSRP threshold list configuration of the neighboring cells, an RSRP interval of the eMTC terminal in each neighboring cell RSRP, and further determines that an enhanced coverage level corresponding to the RSRP interval is an enhanced coverage level of the eMTC terminal in each neighboring cell. The manner of determining the RSRP interval of each cell RSRP is defined in the 3GPP 36.321 protocol, and is not described herein again. And if the enhanced coverage grade of a certain adjacent cell is supported by the eMTC terminal, selecting the adjacent cell as a target cell.

And S35, sending a switching request message to the target base station where the target cell is located.

Specifically, after selecting a target cell, a source base station sends a handover request message to a base station where the target cell is located, where the handover request message carries information such as a target cell identifier, a target base station identifier, and an enhanced coverage level supported by an eMTC terminal.

S36, receiving the handover request confirm message of the target base station, and sending an RRC connection reconfiguration message to the eMTC terminal.

Specifically, after receiving a handover request message sent by a source base station, a target base station acquires an enhanced coverage level supported by an eMTC terminal, and performs admission control. And if the admission is successful, preparing the physical resource configuration corresponding to the enhanced coverage grade, and sending a switching command to the source base station by including the switching command in a switching request confirmation message, wherein the switching request confirmation message carries the coverage enhanced grade of the target cell or the RSRP threshold list configuration. After receiving the switching request confirmation message, the source base station forwards the switching command to the eMTC terminal through the RRC connection reconfiguration message.

The method of the embodiment of the invention evaluates the enhanced coverage grade of the eMTC terminal in the adjacent cell by the configuration of the PRACH of the cell acquired by the source base station before switching in combination with the RSRP information of the cell reported by the eMTC terminal, and selects a proper target cell for the eMTC terminal in combination with the enhanced coverage grade supported by the eMTC terminal, thereby avoiding the failure of the eMTC terminal to switch to the target cell caused by the fact that the eMTC terminal does not support the enhanced coverage grade in the target cell, and reducing the failure rate of the eMTC terminal switching.

Example two

As shown in fig. 7, a cell handover method applied to an eMTC terminal according to an embodiment of the present invention includes:

and S71, measuring the adjacent cells corresponding to the frequency points according to the measurement configuration carried by the measurement control message when the measurement control message sent by the source base station is received, and feeding back a measurement report to the source base station, wherein the measurement report carries RSRP information of the adjacent cells.

Specifically, after receiving a measurement control message sent by a source base station, the eMTC terminal performs corresponding measurement on an adjacent cell corresponding to a frequency point according to measurement configuration carried in the measurement control message, reports the measurement result to the source base station if the measurement result satisfies report configuration, and does not report if the measurement result does not satisfy the report configuration.

S72, receiving RRC connection reconfiguration information sent by the source base station, desynchronizing from the source base station, and initiating access to the target cell according to the PRACH resource corresponding to the enhanced coverage level configured by the target base station.

Specifically, the eMTC terminal receives an RRC connection reconfiguration message sent by the source base station, and acquires a handover command carried therein. The command contains the enhanced coverage grade configured by the target base station, the eMTC terminal is desynchronized from the source base station, and meanwhile, access is initiated to the target cell according to the PRACH resource corresponding to the enhanced coverage grade configured by the target base station.

And S73, after the access is successful, sending an RRC reconfiguration completion message to the target base station.

In the embodiment of the invention, the target cell to be switched is selected by the source base station according to the measurement result reported by the eMTC terminal, the enhanced coverage grade of the target cell and the capability of the eMTC terminal, so that the cell switching failure can be avoided.

EXAMPLE III

As shown in fig. 8, a cell handover method applied to a target base station according to an embodiment of the present invention includes:

and S81, receiving the switching request message sent by the source base station, acquiring the enhanced coverage grade and carrying out admission control.

Specifically, the target base station receives a Handover Request message sent by the source base station, acquires an enhanced coverage level, performs admission control according to the enhanced coverage level and the resource condition of the target cell, and if admission is successful, prepares physical resource configuration of the corresponding enhanced coverage level, and sends a Handover command to the source base station after including the Handover Request Acknowledge message (Handover Request Acknowledge); and if the admission is unsuccessful, sending an admission failure message to the source base station.

And S82, if the admission is successful, configuring corresponding PRACH resources of the enhanced coverage level, and sending a switching request confirmation message to the source base station.

Example four

As shown in fig. 9, a cell handover method provided in an embodiment of the present invention includes:

s91, the source base station sends a measurement control message to the eMTC terminal.

Specifically, after the eMTC terminal selects a suitable PRACH resource to access the source base station, the source base station issues, to the terminal eMTC terminal, measurement configuration corresponding to a frequency point of an adjacent cell if the adjacent cell supporting the eMTC attribute exists according to the acquired adjacent cell.

S92, the eMTC terminal sends a measurement report to the source base station.

And S93, the source base station selects the target cell according to the measurement information of the adjacent cell and the SRP threshold list.

In this embodiment, it is assumed that the RSRP threshold list includes three RSRP thresholds, which are threshold 1, threshold 2, and threshold 3, respectively; if the RSRP value of the cell measured by the terminal is less than the threshold 3, judging that the cell is at CE Level 3; otherwise, if the RSRP value of the cell measured by the terminal is less than the threshold 2, the cell is judged to be at CE Level 2; otherwise, if the measured cell RSRP value of the terminal is less than the threshold 1, judging that the measured cell RSRP value is at the cell CE Level 1; otherwise, the cell CE Level0 is determined.

For example, the three thresholds of the RSRP threshold list of the neighboring cell 2 obtained by the source base station are respectively-110 dBm, -120dBm and-130 dBm for threshold 2 and threshold 3; the three obtained thresholds of the RSRP threshold list of the neighboring cell 3 are respectively-110 dBm, -120dBm and-130 dBm, respectively. And the source base station issues measurement configuration of corresponding frequency points of the adjacent cell 2 and the adjacent cell 3 to the eMTC terminal. The eMTC terminal measures and reports that the channel quality of the neighboring cell 2 and the neighboring cell 3 is RSRP2 ═ 115dBm and RSRP3 ═ 125dBm, respectively. The source base station judges that the RSRP2 is smaller than a threshold 1 configured by an adjacent cell 2 and larger than the threshold 2, and then judges that the eMTC terminal is at CE Level1 of the adjacent cell 2; and judging that the RSRP3 is smaller than a threshold 2 configured by the adjacent cell 3 and larger than the threshold 3, and judging that the eMTC terminal is at CE Level2 of the adjacent cell 3. If the eMTC terminal capability only supports ModeA (i.e., supports CE Level0 and CE Level1) and does not support ModeB (i.e., supports CE Level2 and CE Level3), to avoid handover failure, the neighboring cell 2 is selected as a handover target cell for the terminal, and the neighboring cell 3 is not selected as a handover target cell.

It should be noted that, in the above example, only the threshold lists of RSRP configured by the neighboring cells are listed as the same, but the present invention is not limited to this in practical application, and the same applies to the case where the threshold lists of RSRP configured by the neighboring cells are different.

S94, the source base station sends a switching request message to the target base station where the target cell is located.

Specifically, after selecting a suitable target cell according to RSRP measurement information reported by the terminal and PRACH resource configuration (such as an RSRP threshold list) of an adjacent cell, the source base station sends a Handover Request message (Handover Request) to a base station corresponding to the target cell.

And S95, the target base station acquires the coverage enhancement level to perform admission control.

S96, the target base station sends a switching request confirmation message to the source base station.

S97, the source base station sends an RRC reconfiguration message to the eMTC terminal.

And S98, desynchronizing from the source base station and initiating access according to the PRACH resource corresponding to the enhanced coverage level of the target cell.

And S99, the eMTC terminal sends an RRC reconfiguration complete message to the target base station.

EXAMPLE five

An embodiment of the present invention provides a base station, where the base station includes a memory, a processor, and a computer program stored in the memory and capable of running on the processor, and when the computer program is executed by the processor, the steps of the cell handover methods in the first embodiment, the third embodiment, and the fourth embodiment are implemented.

It should be noted that the base station in this embodiment and the first, third, and fourth embodiments of the cell switching method belong to the same concept, and technical features in the method embodiments are correspondingly applicable to the base station in this embodiment, and specific implementation processes thereof are detailed in the method embodiments and will not be described herein again.

Example six

An embodiment of the present invention provides an eMTC terminal, where the eMTC terminal includes a memory, a processor, and a computer program stored in the memory and capable of running on the processor, and when the computer program is executed by the processor, the steps of the cell handover method according to the second embodiment are implemented.

It should be noted that the eMTC terminal in this embodiment and the second embodiment of the cell switching method belong to the same concept, and technical features in the method embodiment are correspondingly applicable to the eMTC terminal in this embodiment, and specific implementation procedures thereof are detailed in the method embodiment and will not be described herein again.

In addition, an embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps of the cell handover method in any one of the first to fourth embodiments are implemented.

It should be noted that the above-mentioned computer-readable storage medium and the above-mentioned cell handover method embodiment belong to the same concept, and specific implementation processes thereof are detailed in the method embodiment, and technical features in the method embodiment are applicable to both the device and the computer-readable storage medium, which are not described herein again.

It will be understood by those of ordinary skill in the art that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, or suitable combinations thereof.

In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as is well known to those skilled in the art.

The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, and are not intended to limit the scope of the embodiments of the invention. Any modifications, equivalents and improvements that may occur to those skilled in the art without departing from the scope and spirit of the embodiments of the present invention are intended to be within the scope of the claims of the embodiments of the present invention.

Claims

1. A cell switching method is applied to a source base station, and comprises the following steps:

acquiring Reference Signal Received Power (RSRP) threshold list configuration of an adjacent cell to determine whether the adjacent cell supports an enhanced machine type communication (eMTC) terminal;

issuing a measurement control message to an eMTC terminal, wherein the measurement control message carries a frequency point of the adjacent cell supporting the eMTC terminal and corresponding measurement configuration;

receiving a measurement report fed back by the eMTC terminal, wherein the measurement report carries RSRP information of the adjacent cell;

determining that the eMTC terminal is in the enhanced coverage grade of the adjacent cell according to the RSRP information of the adjacent cell and the RSRP threshold list configuration of the adjacent cell, and selecting the adjacent cell with the enhanced coverage grade supported by the eMTC terminal as a target cell;

and receiving a switching request confirmation message of the target base station, and sending a Radio Resource Control (RRC) connection reconfiguration message to the eMTC terminal.

2. The cell handover method according to claim 1, wherein the obtaining RSRP threshold list configuration of the neighboring cell specifically includes:

and acquiring the RSRP threshold list configuration of the adjacent cell through an X2 interface, a base station configuration update message or a network management platform.

3. The cell handover method according to claim 2, wherein the obtaining RSRP threshold list configuration of the neighboring cell via the X2 interface specifically includes:

the source base station adds the RSRP threshold list configuration of each cell in the PRACH configuration, and establishes a request message through X2 and sends the request message to the adjacent base station;

and after receiving the X2 establishment response message fed back by the adjacent base station, acquiring the RSRP threshold list configuration of each cell of the adjacent base station from the PRACH configuration of the X2 establishment response message.

4. The cell handover method according to claim 2, wherein the obtaining of the RSRP threshold list configuration of the neighboring cell through the base station configuration update message specifically includes:

the source base station adds the RSRP threshold list configuration of each cell in the PRACH configuration and sends the configuration update message to the adjacent base station;

and after receiving a configuration updating confirmation message of the adjacent base station, acquiring RSRP threshold list configuration of each cell of the adjacent base station from PRACH configuration of the configuration updating confirmation message.

5. The cell handover method according to claim 2, wherein the obtaining, by the network management platform, the RSRP threshold list configuration of the neighboring cell specifically includes:

the source base station acquires an adjacent cell list from the network management platform and acquires RSRP threshold list configuration attributes of each adjacent cell in the adjacent cell list;

wherein RSRP threshold list configuration attributes of neighboring cells are added to the neighboring cell list by the network management platform.

6. The cell handover method according to any one of claims 1 to 5, wherein the determining that the eMTC terminal is in the enhanced coverage level of the neighboring cell according to RSRP information of the neighboring cell and RSRP threshold list configuration of the neighboring cell, and selecting a neighboring cell with the enhanced coverage level supported by the eMTC terminal as a target cell specifically includes:

acquiring RSRP information of the eMTC terminal in each adjacent cell from the measurement report;

determining an RSRP interval in which the eMTC terminal is positioned in the RSRP information of each adjacent cell according to the RSRP threshold list configuration of each adjacent cell;

determining an enhanced coverage level of the eMTC terminal in each adjacent cell according to the RSRP interval of the eMTC terminal in each adjacent cell;

the method comprises the steps of obtaining an enhanced coverage grade supported by an eMTC terminal, and if the enhanced coverage grade supported by the eMTC terminal is in the enhanced coverage grade of a certain adjacent cell, selecting the adjacent cell as a target cell.

7. A base station comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of the cell handover method according to any one of claims 1 to 6.

8. A storage medium, characterized in that the storage medium has stored thereon a computer program which, when being executed by a processor, carries out the steps of the cell handover method according to any one of claims 1 to 6.